Route and chains of transmission of an imported measles case Traveled to Puerto Iguazu, Argentina: 14-16 March Traveled to Montevideo, Uruguay:17 March. Returned to Buenos Aires on the same day. ❶ ❷ Secondary cases 36 year-old Argentinian male, who was on the same flight as the tourist. Date of Rash Onset: 2 April 2019 44 year-old unvaccinated Uruguayan female, who was on the same ferry as the Russian tourist. 51 year-old Uruguayan male, who may be a potential contact of the Russian tourist. He had one dose of the MMR vaccine. Date of Rash Onset: 6 April 2019 Genotype D8, lineage MVs/Gir Somnath.IND/42.16 was identified among the index case and 36 year-old Argentinean male; this strain has widespread distribution in Asia and Europe. Outbreak control measures in Argentina and Uruguay are ongoing. 39 year-old unvaccinated Russian tourist from Russia, who arrived to Argentina on 9 March Date of Rash Onset: 17 March Index case Route of the case during communicable period: 13-21 March Source: Dirección Nacional de Epidemiologia y Análisis de Situación de Salud, Dirección de Control de Enfermedades Inmunoprevenibles, Ministerio de Salud y Desarollo Social, Argentina.